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4grayandClaude Opus 5
6114c2d459
Codex P2 on #1364, the fourth in this class. RFC 6761 §6.3 reserves `localhost` AND every name ending in `.localhost` for the loopback interface, and resolvers honour it — so `http://stream.localhost/ch/1234_` reached the player's own machine instead of being sent to the portal to resolve. Closed the class rather than adding one more name: the suffix is matched, and `localhost.localdomain` goes in with it as the conventional `/etc/hosts` alias for 127.0.0.1 on most Linux systems. Together with the earlier rounds the predicate now covers `localhost` and `*.localhost`, `localhost.localdomain`, `127.0.0.0/8`, `0.0.0.0`, `::1`, `::`, the IPv4-mapped forms `URL` rewrites to hex, and a terminal DNS root dot on any of them. Only the suffix is reserved, so the guard must not over-match: tests pin that `localhost.cdn.example` and `notlocalhost` remain ordinary routable names and keep playing statically. Mutation-checked: dropping the suffix rule and the localdomain alias fails four tests and nothing else. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>